Shadorne, the comment you quoted was regarding putting speaker cables on risers, not putting the speakers on risers.
Oops my bad. I retract my statement then. There is indeed no strong reason to use cable elevators in that there is no credible science behind this concept. Insulated elevators are used for uninsulated power wires in free air as it is cheaper than insulating the wires. These are designed to prevent the bare wires shorting to ground. In some cases they have intricate shapes so that the path length (over the surface)to ground is long (this can help when it is wet or raining or the piece becomes dusty/dirty). Of course if it looks cool, keeps wires off the carpet where they can be damaged by traffic and for those that like it - then by all means go for it but it would be an odd situation that would create audible effects from this procedure.